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The mechanisms of plaster drying

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Abstract

We show that the drying rate of plaster pastes is significantly lower than that expected for a pure liquid evaporating from a simple homogeneous porous medium. This effect is enhanced by the air flow velocity and the initial solid/water ratio. Further tests under various conditions and with the help of additional techniques (MRI, ESEM, Micro-tomography) for measuring the drying rate and local characteristics (water content, porosity) prove that this effect is due to the crystallization of gypsum ions below the sample free surface, which creates a dry region and decreases the drying rate by increasing the length of the path that the vapour has to follow before reaching the free surface.

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Acknowledgements

We thank David Hautemayou for his technical support.

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Authors and Affiliations

  1. Université Paris-Est, Laboratoire Navier, ENPC-IFSTTAR-CNRS, Champs-sur-Marne, France

    M. D. Seck, P. Faure, S. Rodts, E. Keita & P. Coussot

  2. Saint-Gobain Recherche, Aubervilliers, France

    M. D. Seck, M. Van Landeghem & P. Cavalié

  3. Laboratoire des Géomatériaux, Université de Marne La Vallée, Marne la Vallée, France

    R. Combes

Authors
  1. M. D. Seck
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  2. M. Van Landeghem
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  3. P. Faure
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  4. S. Rodts
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  5. R. Combes
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  6. P. Cavalié
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  7. E. Keita
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  8. P. Coussot
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Correspondence to P. Coussot.

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Seck, M.D., Van Landeghem, M., Faure, P. et al. The mechanisms of plaster drying. J Mater Sci 50, 2491–2501 (2015). https://doi.org/10.1007/s10853-014-8807-x

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  • DOI: https://doi.org/10.1007/s10853-014-8807-x

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